Investigation of passive scalar mixing in a confined rectangular wake using simultaneous PIV and PLIF

Feng, H. Q.; Olsen, Michael G.; Hill, James C.; Fox, Rodney O.

doi:10.1016/j.ces.2010.02.038

Cited by 16 publications

(14 citation statements)

References 35 publications

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“…high peek values close to the walls. However, in the near wake, the current vortex areas are about two orders of magnitude smaller than in the previous report Feng et al (2010) ; in the far wake, they are almost four order of magnitude smaller. Again, this can be explained based on the difference between the two measurement techniques, as we argued in Kong et al (2010) and also in previous section.…”

Section: Size and Strength Of Vortex Corescontrasting

confidence: 74%

“…3.20 and 3.21, the correlations in far upstream and downstream are very weak, unlike R λv contours showing the neighboring vortices. Also, considering these two horizontally oriented wings of the R λ ci φ together, one can imagine the auto-correlation of R φ φ will have a horizontally orientated elliptic shape, which is reported in a previous paper (Feng et al, 2010). Notice also as the corrections with the velocity fluctuations, the size of the correlation area becomes steadily larger with increasing downstream distance.…”

Section: Spatial Correlation Functions and Linear Stochastic Estimationsupporting

confidence: 51%

“…The experimental data used in the current study was collected by Feng and published in Feng et al (2010). The following is a brief description of the flow facility and experiment setups, and more detailed information can be found in Feng et al (2010). The flow facility used in the experiments presented here is shown in Fig.…”

Section: Experimental Facility and Methodologymentioning

confidence: 99%

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Experimental and computational study of turbulent mixing in a confined rectangular jet

Kong¹

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Stream-wise rms velocity profiles at four locations downstream of the splitter plates. Experiments are shown as symbols and LES as lines.. xii 4.10 Wall-normal rms velocity profile at four locations downstream of the splitter plates. Experiments are shown as symbols and LES as lines.. 4.11 Span-wise rms velocity profile at four locations downstream of the splitter plates. Experimental data are not available for comparisons.. .. . 4.12 Resolved shear stress at four locations downstream of the splitter plates. Experiments are shown as symbols and LES as lines.. .. .. .. .. . 4.13 Correlation coefficient profiles at four locations downstream of the splitter plates. Experiments are shown as symbols and LES as lines.. .. . 4.14 Skewness and kurtosis for u-and v-velocity at x/d = 4.5. Experiments

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Section: Size and Strength Of Vortex Corescontrasting

confidence: 74%

Section: Spatial Correlation Functions and Linear Stochastic Estimationsupporting

confidence: 51%

Section: Experimental Facility and Methodologymentioning

confidence: 99%

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Experimental and computational study of turbulent mixing in a confined rectangular jet

Kong¹

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“…A strong spatial variation of Pr T is observed. Feng et al (2007Feng et al ( , 2010 also report a spatial variation of measured Pr T around 0.8. However, in our study, at the upstream of the stratified jet, Pr T is a value ranging from 0.6 (close to the center) to 1.4 (close to the edge).…”

Section: Eddy Viscosity and Eddy Diffusivitymentioning

confidence: 93%

Experimental study of stratified jet by simultaneous measurements of velocity and density fields

Chen

2012

Exp Fluids

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Stratified flows with small density difference commonly exist in geophysical and engineering applications, which often involve interaction of turbulence and buoyancy effect. A combined particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) system is developed to measure the velocity and density fields in a dense jet discharged horizontally into a tank filled with light fluid. The illumination of PIV particles and excitation of PLIF dye are achieved by a dual-head pulsed Nd:YAG laser and two CCD cameras with a set of optical filters. The procedure for matching refractive indexes of two fluids and calibration of the combined system are presented, as well as a quantitative analysis of the measurement uncertainties. The flow structures and mixing dynamics within the central vertical plane are studied by examining the averaged parameters, turbulent kinetic energy budget, and modeling of momentum flux and buoyancy flux. At downstream, profiles of velocity and density display strong asymmetry with respect to its center. This is attributed to the fact that stable stratification reduces mixing and unstable stratification enhances mixing. In stable stratification region, most of turbulence production is consumed by mean-flow convection, whereas in unstable stratification region, turbulence production is nearly balanced by viscous dissipation. Experimental data also indicate that at downstream locations, mixing length model performs better in mixing zone of stable stratification regions, whereas in other regions, eddy viscosity/diffusivity models with static model coefficients represent effectively momentum and buoyancy flux terms. The measured turbulent Prandtl number displays strong spatial variation in the stratified jet.

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“…Planar laser-induced fluorescence (PLIF) has been one of the primary techniques for studying turbulent mixing at the macroscale [85][86][87]. By using a fluorescent dye in one or more of the inlet streams, mixing of a measured scalar in a small volume covered by a thin laser sheet can be visualized and quantified.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational investigation of turbulent mixing in microscale reactors

Shi

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Investigation of passive scalar mixing in a confined rectangular wake using simultaneous PIV and PLIF

Cited by 16 publications

References 35 publications

Experimental and computational study of turbulent mixing in a confined rectangular jet

Experimental and computational study of turbulent mixing in a confined rectangular jet

Experimental study of stratified jet by simultaneous measurements of velocity and density fields

Experimental and computational investigation of turbulent mixing in microscale reactors

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